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SN74LVC138AQDRQ1
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Texas Instruments Signal Switches, Multiplexers, Decoders, SOIC-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+52@@ -0,0 +1,52 @@+# SN74LVC138AQDRQ1++**Texas Instruments** · Signal Switches, Multiplexers, Decoders · SOIC-16++SN74LVC138AQDRQ1 from Texas Instruments, in a SOIC-16. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | A | input | Binary select input A (LSB); accepts input voltages from 0 V to 5.5 V with VCC operating from 2 V to 3.6 V; selects one of eight active-low outputs in combination with B and C. |+| 2 | B | input | Binary select input B; accepts input voltages from 0 V to 5.5 V with VCC operating from 2 V to 3.6 V; selects one of eight active-low outputs in combination with A and C. |+| 3 | C | input | Binary select input C (MSB); accepts input voltages from 0 V to 5.5 V with VCC operating from 2 V to 3.6 V; selects one of eight active-low outputs in combination with A and B. |+| 4 | G2A | input | Active-low enable input; when HIGH, forces all outputs HIGH regardless of select inputs or G1 and G2B; VIH = 2 V min, VIL = 0.8 V max at VCC = 2.7 V to 3.6 V. |+| 5 | G2B | input | Active-low enable input; when HIGH, forces all outputs HIGH regardless of select inputs or G1 and G2A; VIH = 2 V min, VIL = 0.8 V max at VCC = 2.7 V to 3.6 V. |+| 6 | G1 | input | Active-high enable input; when LOW, forces all outputs HIGH regardless of select inputs or G2A and G2B; VIH = 2 V min, VIL = 0.8 V max at VCC = 2.7 V to 3.6 V. |+| 7 | Y7 | output | Active-low decoded output Y7; driven LOW when G1=H, G2A=L, G2B=L, C=H, B=H, A=H; IOL max 24 mA, IOH max −24 mA at VCC = 3 V; max tpd 5.8 ns at 3.3 V. |+| 8 | GND | power_in | Ground supply reference; continuous current through GND pin rated ±100 mA. |+| 9 | Y6 | output | Active-low decoded output Y6; driven LOW when G1=H, G2A=L, G2B=L, C=H, B=H, A=L; IOL max 24 mA, IOH max −24 mA at VCC = 3 V; max tpd 5.8 ns at 3.3 V. |+| 10 | Y5 | output | Active-low decoded output Y5; driven LOW when G1=H, G2A=L, G2B=L, C=H, B=L, A=H; IOL max 24 mA, IOH max −24 mA at VCC = 3 V; max tpd 5.8 ns at 3.3 V. |+| 11 | Y4 | output | Active-low decoded output Y4; driven LOW when G1=H, G2A=L, G2B=L, C=H, B=L, A=L; IOL max 24 mA, IOH max −24 mA at VCC = 3 V; max tpd 5.8 ns at 3.3 V. |+| 12 | Y3 | output | Active-low decoded output Y3; driven LOW when G1=H, G2A=L, G2B=L, C=L, B=H, A=H; IOL max 24 mA, IOH max −24 mA at VCC = 3 V; max tpd 5.8 ns at 3.3 V. |+| 13 | Y2 | output | Active-low decoded output Y2; driven LOW when G1=H, G2A=L, G2B=L, C=L, B=H, A=L; IOL max 24 mA, IOH max −24 mA at VCC = 3 V; max tpd 5.8 ns at 3.3 V. |+| 14 | Y1 | output | Active-low decoded output Y1; driven LOW when G1=H, G2A=L, G2B=L, C=L, B=L, A=H; IOL max 24 mA, IOH max −24 mA at VCC = 3 V; max tpd 5.8 ns at 3.3 V. |+| 15 | Y0 | output | Active-low decoded output Y0; driven LOW when G1=H, G2A=L, G2B=L, C=L, B=L, A=L; IOL max 24 mA, IOH max −24 mA at VCC = 3 V; max tpd 5.8 ns at 3.3 V. |+| 16 | VCC | power_in | Positive supply voltage; recommended operating range 2 V to 3.6 V (data retention only at 1.5 V), absolute maximum 6.5 V; continuous current rating ±100 mA. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-16 |+| Category | Logic |+| Pins | 16 |++## CAD (KiCad official)++- Symbol: `SN74LVC138AQDRQ1`+- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`+- 3D model: SOIC-16 (KiCad packages3D, STEP)+- 3D model files: `sn74lvc138aqdrq1-etched.step` / `sn74lvc138aqdrq1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74lvc138aqdrq1.step` / `sn74lvc138aqdrq1.glb` are the bare package body.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/sn74lvc138a-q1) (14 pp, sha256 `475d05357e72f862`, retrieved 2026-09-27, tier: lcsc)+- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-4-6` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/sn74lvc138aqdrq1-datasheet.pdf)
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accepts input voltages from 0 V to 5.5 V with VCC operating from 2 V to 3.6 V; selects one of eight active-low outputs in combination with B and C."+ },+ {+ "number": "2",+ "name": "B",+ "type": "input",+ "description": "Binary select input B; accepts input voltages from 0 V to 5.5 V with VCC operating from 2 V to 3.6 V; selects one of eight active-low outputs in combination with A and C."+ },+ {+ "number": "3",+ "name": "C",+ "type": "input",+ "description": "Binary select input C (MSB); accepts input voltages from 0 V to 5.5 V with VCC operating from 2 V to 3.6 V; selects one of eight active-low outputs in combination with A and B."+ },+ {+ "number": "4",+ "name": "G2A",+ "type": "input",+ "description": "Active-low enable input; when HIGH, forces all outputs HIGH regardless of select inputs or G1 and G2B; VIH = 2 V min, VIL = 0.8 V max at VCC = 2.7 V to 3.6 V."+ },+ {+ "number": "5",+ "name": "G2B",+ "type": "input",+ "description": "Active-low enable input; when HIGH, forces all outputs HIGH regardless of select inputs or G1 and G2A; VIH = 2 V min, VIL = 0.8 V max at VCC = 2.7 V to 3.6 V."+ },+ {+ "number": "6",+ "name": "G1",+ "type": "input",+ "description": "Active-high enable input; when LOW, forces all outputs HIGH regardless of select inputs or G2A and G2B; VIH = 2 V min, VIL = 0.8 V max at VCC = 2.7 V to 3.6 V."+ },+ {+ "number": "7",+ "name": "Y7",+ "type": "output",+ "description": "Active-low decoded output Y7; driven LOW when G1=H, G2A=L, G2B=L, C=H, B=H, A=H; IOL max 24 mA, IOH max −24 mA at VCC = 3 V; max tpd 5.8 ns at 3.3 V."+ },+ {+ "number": "8",+ "name": "GND",+ "type": "power_in",+ "description": "Ground supply reference; continuous current through GND pin rated ±100 mA."+ },+ {+ "number": "9",+ "name": "Y6",+ "type": "output",+ "description": "Active-low decoded output Y6; driven LOW when G1=H, G2A=L, G2B=L, C=H, B=H, A=L; IOL max 24 mA, IOH max −24 mA at VCC = 3 V; max tpd 5.8 ns at 3.3 V."+ },+ {+ "number": "10",+ "name": "Y5",+ "type": "output",+ "description": "Active-low decoded output Y5; driven LOW when G1=H, G2A=L, G2B=L, C=H, B=L, A=H; IOL max 24 mA, IOH max −24 mA at VCC = 3 V; max tpd 5.8 ns at 3.3 V."+ },+ {+ "number": "11",+ "name": "Y4",+ "type": "output",+ "description": "Active-low decoded output Y4; driven LOW when G1=H, G2A=L, G2B=L, C=H, B=L, A=L; IOL max 24 mA, IOH max −24 mA at VCC = 3 V; max tpd 5.8 ns at 3.3 V."+ },+ {+ "number": "12",+ "name": "Y3",+ "type": "output",+ "description": "Active-low decoded output Y3; driven LOW when G1=H, G2A=L, G2B=L, C=L, B=H, A=H; IOL max 24 mA, IOH max −24 mA at VCC = 3 V; max tpd 5.8 ns at 3.3 V."+ },+ {+ "number": "13",+ "name": "Y2",+ "type": "output",+ "description": "Active-low decoded output Y2; driven LOW when G1=H, G2A=L, G2B=L, C=L, B=H, A=L; IOL max 24 mA, IOH max −24 mA at VCC = 3 V; max tpd 5.8 ns at 3.3 V."+ },+ {+ "number": "14",+ "name": "Y1",+ "type": "output",+ "description": "Active-low decoded output Y1; driven LOW when G1=H, G2A=L, G2B=L, C=L, B=L, A=H; IOL max 24 mA, IOH max −24 mA at VCC = 3 V; max tpd 5.8 ns at 3.3 V."+ },+ {+ "number": "15",+ "name": "Y0",+ "type": "output",+ "description": "Active-low decoded output Y0; driven LOW when G1=H, G2A=L, G2B=L, C=L, B=L, A=L; IOL max 24 mA, IOH max −24 mA at VCC = 3 V; max tpd 5.8 ns at 3.3 V."+ },+ {+ "number": "16",+ "name": "VCC",+ "type": "power_in",+ "description": "Positive supply voltage; recommended operating range 2 V to 3.6 V (data retention only at 1.5 V), absolute maximum 6.5 V; continuous current rating ±100 mA."+ }+ ],+ "provenance": {+ "extractor": "extract_pins 0.2",+ "factory_chain": {+ "factory": "2.0.0",+ "extractor": "extract_pins 0.2",+ "primary_model": "claude-haiku-4-5-20251001",+ "primary_mode": "text",+ "consensus_model": "claude-sonnet-4-6",+ "consensus": "agreed",+ "guards": "pin_guards 0.1: passed",+ "guard_notes": [],+ "pages_sent": 14,+ "cost_usd": 0.3334,+ "at": "2026-09-27T05:46:58"+ },+ "datasheet": {+ "url": "https://www.ti.com/cn/lit/gpn/sn74lvc138a-q1",+ "pages": 14,+ "sha256": "475d05357e72f862",+ "source_tier": "lcsc"+ },+ "cad": "KiCad official (CC-BY-SA 4.0)",+ "pins": {+ "total": 16,+ "described": 16,+ "cites_pages": true,+ "refuses_to_fabricate": true+ }+ },+ "viewers": {+ "symbol": "viewers/symbol.html",+ "footprint": "viewers/footprint.html"+ }+ },+ "visibility": "public",+ "org": "adom",+ "author": {+ "name": "Ray",+ "email": "[email protected]"+ }+}